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add fdlibm

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git-svn-id: http://svn2.nishi.boats/svn/milsko/trunk@557 b9cfdab3-6d41-4d17-bbe4-086880011989
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Nishi 2025-11-01 15:48:47 +00:00
commit 7f523a3d76
90 changed files with 7325 additions and 309 deletions
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46
external/fdlibm/s_frexp.c vendored Normal file
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/* @(#)s_frexp.c 1.4 95/01/18 */
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunSoft, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
/*
* for non-zero x
* x = frexp(arg,&exp);
* return a double fp quantity x such that 0.5 <= |x| <1.0
* and the corresponding binary exponent "exp". That is
* arg = x*2^exp.
* If arg is inf, 0.0, or NaN, then frexp(arg,&exp) returns arg
* with *exp=0.
*/
#include "math.h"
static const double
two54 = 1.80143985094819840000e+16; /* 0x43500000, 0x00000000 */
double frexp(double x, int* eptr) {
int hx, ix, lx;
hx = __HI(x);
ix = 0x7fffffff & hx;
lx = __LO(x);
*eptr = 0;
if(ix >= 0x7ff00000 || ((ix | lx) == 0)) return x; /* 0,inf,nan */
if(ix < 0x00100000) { /* subnormal */
x *= two54;
hx = __HI(x);
ix = hx & 0x7fffffff;
*eptr = -54;
}
*eptr += (ix >> 20) - 1022;
hx = (hx & 0x800fffff) | 0x3fe00000;
__HI(x) = hx;
return x;
}